文件中提供了多种模式的grep

Question

I have a couple of patterns I would like to ask grep to find in some files. Assume I have a file containing

pattern1
pattern2
pattern3
pattern4
...
patternx

and instead of editing a grep in front of each pattern,like:

grep pattern1 arg
grep pattern2 arg
...
grep patternx arg

I would prefer to feed the whole amount of patterns one time to grep and have grep produce the output.

I could iterate in a sh for loop of course but the question whether it is possible using grep one time is what I'm asking myself here

Answer 1

If I am understanding you correctly, you are looking for this:

grep -f yourPatFile /path/files

You can read man page of grep to find out the details of -f option, basically it allows grep to use patterns in a file(each line as pattern)